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Old 10-08-2003, 12:47 AM   #1
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Default Final gear ratio for different motor

Hi, I always wonder how to estimate the initial FGR for different turn of motors. For example, I know the ideal FGR for my XRAY T1R with 13 turn motor is about 7.6, what if I go for a 9 turn, 17 turn or 23 turn motor? Is there a rule of thumb to estimate the initial FGR? The gear ratio chart that came with the manual is useless, because it doesn't tell you the estimate FGR for different turn of motors. Of course, I can simple go to my local hobby store to ask for the gear ratio for different motor, but I really want to learn the theory behind it.


Thanks!
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Old 10-08-2003, 12:54 AM   #2
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You dont want to know what pinion to use with a different motor?

Your manual should state best pinion for each wind.

I try to base my pinon's on a number of variables which include

Spur
Gearbox Reduction
Tire size
Motor Rpm

from that you can pretty much figure out anything you need to know with some mathmatics, but as I stated in a previous thread

http://www.rctech.net/forum/showthre...threadid=25425

Most motor manufactures dont state rpm, so your stuck like the rest of us, but 10 pinons and try em out.
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Old 10-08-2003, 01:40 AM   #3
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No, the manual don't have anything to say about what pionion to use with different motor, that's the problem.


Quote:
Originally posted by seriousre
You dont want to know what pinion to use with a different motor?

Your manual should state best pinion for each wind.

I try to base my pinon's on a number of variables which include

Spur
Gearbox Reduction
Tire size
Motor Rpm

from that you can pretty much figure out anything you need to know with some mathmatics, but as I stated in a previous thread

http://www.rctech.net/forum/showthre...threadid=25425

Most motor manufactures dont state rpm, so your stuck like the rest of us, but 10 pinons and try em out.
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Old 10-08-2003, 01:49 AM   #4
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Let me know these things and I can give you a good start

Model of car
Final gear ratio with whatever motor it comes with
turn count on motor it comes with or what your running now
Tire Diameter
Spur Teeth
Pinion Teeth
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